Update README.md

Author: 311ba2 5453bf

README.md

@@ -1,2 +1,10 @@
 # ftprobe
-Check if FTP server allows anonymous logins with no overhead.
+
+Barebones command-line utility to check if anonymous can successfully login on a given FTP server. Compile with whatever and run
+
+```
+ftprobe 1.1.1.1
+ftprobe ftp.example.com
+```
+
+It will print `OK\n` if anon is allowed and nothing if not. Use something like GNU `parallel` to perform mass-scans. ftprobe puts *much* less strain on memory, network and CPU than lftp and even ftp. A consumer CPU should handle a few hundred parallel probes with no problems.